From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.bugs Subject: bug#12446: port better to POSIX hosts lacking _setjmp Date: Sat, 15 Sep 2012 01:55:14 -0700 Organization: UCLA Computer Science Department Message-ID: <50544272.2020602@cs.ucla.edu> References: <50538925.3010608@cs.ucla.edu> <83txv0tkho.fsf@gnu.org> <5053A177.1020608@cs.ucla.edu> <83sjaju5ca.fsf@gnu.org> <50543339.3090500@cs.ucla.edu> <83ligbu1uk.fsf@gnu.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1347699366 2967 80.91.229.3 (15 Sep 2012 08:56:06 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 15 Sep 2012 08:56:06 +0000 (UTC) Cc: lekktu@gmail.com, 12446@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sat Sep 15 10:56:08 2012 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1TCoAZ-000783-V8 for geb-bug-gnu-emacs@m.gmane.org; Sat, 15 Sep 2012 10:56:08 +0200 Original-Received: from localhost ([::1]:46294 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TCoAW-0007Ns-6u for geb-bug-gnu-emacs@m.gmane.org; Sat, 15 Sep 2012 04:56:04 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:34225) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TCoAT-0007Nk-K5 for bug-gnu-emacs@gnu.org; Sat, 15 Sep 2012 04:56:02 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TCoAS-0008CK-NW for bug-gnu-emacs@gnu.org; Sat, 15 Sep 2012 04:56:01 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:53415) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TCoAS-0008CG-K0 for bug-gnu-emacs@gnu.org; Sat, 15 Sep 2012 04:56:00 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.72) (envelope-from ) id 1TCoBS-0006I9-8o for bug-gnu-emacs@gnu.org; Sat, 15 Sep 2012 04:57:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Paul Eggert Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sat, 15 Sep 2012 08:57:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 12446 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: patch Original-Received: via spool by 12446-submit@debbugs.gnu.org id=B12446.134769937724131 (code B ref 12446); Sat, 15 Sep 2012 08:57:02 +0000 Original-Received: (at 12446) by debbugs.gnu.org; 15 Sep 2012 08:56:17 +0000 Original-Received: from localhost ([127.0.0.1]:34728 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1TCoAi-0006H9-H4 for submit@debbugs.gnu.org; Sat, 15 Sep 2012 04:56:17 -0400 Original-Received: from smtp.cs.ucla.edu ([131.179.128.62]:60490) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1TCoAg-0006H2-IA for 12446@debbugs.gnu.org; Sat, 15 Sep 2012 04:56:15 -0400 Original-Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.cs.ucla.edu (Postfix) with ESMTP id 4A27B39E8013; Sat, 15 Sep 2012 01:55:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at smtp.cs.ucla.edu Original-Received: from smtp.cs.ucla.edu ([127.0.0.1]) by localhost (smtp.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8-ePmZeM6nO2; Sat, 15 Sep 2012 01:55:11 -0700 (PDT) Original-Received: from [192.168.1.3] (pool-108-23-119-2.lsanca.fios.verizon.net [108.23.119.2]) by smtp.cs.ucla.edu (Postfix) with ESMTPSA id B094039E8008; Sat, 15 Sep 2012 01:55:11 -0700 (PDT) User-Agent: Mozilla/5.0 (X11; Linux i686; rv:15.0) Gecko/20120827 Thunderbird/15.0 In-Reply-To: <83ligbu1uk.fsf@gnu.org> X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:64341 Archived-At: On 09/15/2012 01:28 AM, Eli Zaretskii wrote: > So what was the rationale of turning away from _setjmp Some POSIXish hosts lack _setjmp, but have sigsetjmp, and their longjmp implementations munge the signal masks. >> > Messups are trickier, because they involve rare race conditions. >> > They can occur if Emacs or a system call has set the signal mask to X, >> > but a longjump unexpectedly changes it to Y, where Y is not equal to X. > Why is that a messup? Because Emacs then continues with the wrong sigmask, which can cause signals to be blocked when they shouldn't be.